Table 1: Assessment of selection-, performance- and detection bias risk.

First author Journal Year Vol. First page SB PB DB
Sachdeo [31] EurJProsthodontRestDent 2004 12 15 0 0 0
Soncini [30] JADA 2007 138 763 C 0 C
Bernado [2] JADA 2007 138 775 0 0 0
Li [27] PractClinMed 2005 6 105 0 0 0
Frencken [28] JDR 2006 85 622 0 0 C
Estupiñán-Day [29] PAHO-report/Ecuador 2006 C 0 0

SB = Selection bias; PB = Performance bias; DB = Detection bias; Vol. = Journal volume; EurJProsthodontRestDent = European Journal of Prosthodontic Dentistry; JADA = Journal of the American Dental Association; PractClinMed = Practice Clinical Medicine; JDR = Journal of Dental Research; PAHO = Pan-American Health Organisation.